That may not work, to compile loader you will need sources (maybe including cvs/csup/include directory/ ...) and lots of RAM if you want to do that from LIVE FreeBSD.
Just copying it from cd/dvd will work, I guess, well I never tried.

If you have the full install CD1 (not the bootonly CD), it has a "Fixit" option in the installer. That will load a live FreeBSD system off the CD. Look under /dist once in the fixit shell for everything that comes in a FreeBSD install. Just mount your harddrive partitions onto /mnt, then you can just copy files from /dist to /mnt as needed.

That may not work, to compile loader you will need sources (maybe including cvs/csup/include directory/ ...) and lots of RAM if you want to do that from LIVE FreeBSD.
Just copying it from cd/dvd will work, I guess, well I never tried.

You can just mount the hard disk and store the sources there (If it's not there already).

Also, you don't lots of RAM, we're just compiling the boot loader, not a full buildworld.
On a sidenote, you can compile world with low RAM, it just takes a bit longer (I compiled FreeBSD 6 on my P1 133 / 32MB laptop).

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UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.

If you have the full install CD1 (not the bootonly CD), it has a "Fixit" option in the installer. That will load a live FreeBSD system off the CD. Look under /dist once in the fixit shell for everything that comes in a FreeBSD install. Just mount your harddrive partitions onto /mnt, then you can just copy files from /dist to /mnt as needed.

That was my initial plan (after which I posted here) but I was unable to use many commands (Like ls mount cp etc). I was unsure as to where and how I either get these commands (ie how to mount the hard drive with the commands or relevant part of the disc). Perhaps I was not going to the right section?

I went to Fixit -> Emergency Holographic Shell (Or something along those lines) -> ttyv4

Wrong option. You need to use Fixit --> CD-Rom. If you don't have the full CD1, or the Fixit CD, this option won't work. If you do, then you will be dropped to a command prompt, with a full, working FreeBSD system.